Patent Model - Steam-Gage

Maker and role
D. Wells, Patentee
Production date
Aug 11 1857
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Object detail

Brass, glass, iron
2 x 7 1/2" (5.1 x 19.1cm)
Wells' patent consists "of a case with a circular dial and index all in the usual form. The pressure to be measured or indicated is applied within a flattened elastic tube which is placed within the case and which is folded together so as to present a series of layers of the tube, each layer operating against the succeeding layer in such a manner that the final layer or closed end of the tube will have a motion proportionate to the number layers used. The motion thus obtained is transmitted through a toothed sector and pinion shaft to an index which moves over a graduated arc on the dial." (Patent number 17,988)
Object number
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